The first four, as verbs in a math phrase, would be:
3 + 3 = three PLUS three
3 - 3 = three MINUS three (pronounced MAI-nus)
3 x 3 = three TIMES three
3 (division symbol not on my keyboard) 3 = three DIVIDED BY three
3 = 3 is three EQUALS three

The rest would be read as they are in the picture (2 < 3 is "two is less than 3," etc.)